Automatic take-up piston



1929- G. R. FEIGEL AUTOMATIC TAKE-UP PISTON Filed Sept. 13, 1928. 2 Sheets-Sheet Inventor Gear-9 9 e zg Filed Sept. 15, 1928 2 Sheets-Sheet 2 Inventor Patented Dec. 3, 1929 UNITED STATES GEORGE E. FEIGEL, OF CHICAGO, ILLINOIS AUTOMATIC TAKE-UP rrs'ron Application filed September 13, 1928.

The present invention relates to a leakproof piston to be used to exert hydraulic pressure, and has for its prime object to provide a self-adjusting structure wherein the greater the pressure applied, the more diitlcult it becomes for the liquid to escape.

A further very important object of the invention resides in the provision of a piston of this nature which is simple in its construction, easy to assemble and disassemble, and thoroughly efficient and reliable in use and operation.

'With the above and numerous other objects in view as will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawing:

Fig. 1 is a sectional elevation of the piston embodying the features of this invention showing the same in a cylinder,

Fig. 2 is a disassembled view of the piston core, the bolt, spring and associated parts,

Fig. 3 is a bottom plan view of a plug for a core,

Fig. 4: is a detail section through the base,

Fig. 5 is a transverse section taken substantially on the line 5-5 of Fig. 1,

Fig. 6 is a perspective view of the primary shoe,

Fig. 7 is a perspective view of the secondmy shoe,

Fig. 8 is a sectional view through the piston and cylinder, and,

Fig. 9 is a transverse section taken substantially on the line 99 of Fig. 8.

Referring to the drawings in detail it will be seen that the piston is composed of a frusto-conical core 5, the top surface at the larger end thereof being dished inwardly as indicated at 6. A pocket 7 is formed in the core 5 to extend upwardly or inwardly from the smaller end thereof. The numeral 8 denotes a primary shoe and the numeral 9 a secondary shoe. These shoes are formed each in three segments. The shoe 9 has a peg 10 to fit in a recess in one of the segments of the shoe 8 so as to hold the shoes in a predetermined relationship at all times. A bolt Serial No. 305,814.

11 has its head located in the top of the pocket 7 and extends through a plug 12 threaded in the mouth of the pocket 7. The end of the bolt is threaded through a base 14 which may be threadedly engaged as at 15 with a stem or the like. The bolt has an opening to receive cotter pin 16 so as to lock the base and the bolt together. A spring 17 is disposed about the bolt within the pocket and impinges against the head of the bolt and against the U0 plug 12, thereby drawing the core toward the base tending to cause the expansion of the segments of the primary and secondary shoesS and 9.

It is importa-nt that all sides of the shoes be of highly polished steel and they must be attached so that each three primary and secondary segments of the shoes form perfect fitting circles. The inner sides of these circles must be exactly the same angle as the frusto- '7 conical core. The surface and sides of the piston base 14 must also be polished.

From the above detailed description, it is easy to see that there can be no leaking even though the shoes, primary and secondary spread at their vertical joints because the the secondary shoe has its segments arranged to cover the cracks or joints in the primary shoe and the semi-cone keeps the liquid from escaping in the inner section. The greater the pressure on the dished surface 6 the greater will be the expansion and the tighter will be the piston in the cylinder 20.

It is thought that the construction, utility, operation, and advantages of this invention will now be quite apparent to those skilled in this art without a more detailed description thereof. The present embodiment of the invention has been disclosed in considerable detail merely for the purposes of exemplilication since in actual. practice it attains the features of advantage enumerated as desirable in the statement of the invention and the above description.

It will be apparent that the changes in the details of construction, and in the combination and arrangement of parts may be resorted to without departing from the spirit or scope of the invention hereinafter claimed or sacrificing any of its advantages.

Having thus described my invention what I claim as new is 1. A piston of the class described including a frusto-conical core, a primary and a secondary shoe about the core, each shoe being formed in a plurality of segments, a base, a spring and bolt connection extending axially of the piston between the base and the core tending to spread the segments of the shoes.

2. A piston of the class described including a frusto-conical core, a primary and a secondary shoe about the core, each shoe being formed in a plurality of segments, a base, a spring and bolt connection extending axially of the piston between the base and the core tending to spread the segments of the shoes, the upper larger end of the core being dished V downwardly.

8. A piston of the class described including, in combination, a frusto-conical core, a prim'aryshoe and a secondary shoe circumjacent the core, said shoes being formed in segments, the smaller inner end of the core being formed with a pocket, a bolt having a head in the pocket, a plug threaded in the mouth of the pocket circumjacent the bolt, a spring on the bolt impinging against the head and the plug, a base threadedly engaged on the end of the bolt.

4. A piston of the class described including, in combination, .a frusto-conical core, a primary shoe and a secondary shoe circumjacent the core, said shoes being formed in segments, the smaller inner end of the core being formed with a pocket, a bolt having a head in the pocket, a plug threaded in the mouth of the pocket ciroumjacent the bolt, a spring on the bolt impinging against the head and the plug, a base threadedly engaged on the end of the bolt, a peg between the shoes so that the segments of one shoe are opposite the crack between the other shoe.

5. A piston of the class described including in combination, a frusto-conical core, a

primary shoe and a secondary shoe circumyacent the core, said shoes being formed in segments, the smaller inner end of the core being formed with a pocket, a bolt having a head in the pocket, a plug threaded in the mouth of the pocket circumjacent the bolt, a spring on the bolt impinging against the head and the plug, a base threadedly engaged on the end of the belt, a peg between the shoes so that the segments of one shoe are opposite thecrack between the other shoe, the other larger end of the core being dished inwardly In testimony whereof I affix my signature.

GEORGE R. F EIQEL. 

